my Volkswagen Golf has a check engine light and rough driving experience what’s wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety.

2. Address Error Codes

• Reconnect the OBD-II scanner to the vehicle and note any trouble codes.
• Research the codes to identify the specific issue (e.g., P0300 for misfires).

3. Inspect and Replace Spark Plugs

• Remove the ignition coils or spark plug wires.
• Use a spark plug socket to remove the spark plugs.
• Inspect for wear; replace with new spark plugs if necessary (use recommended type and gap).
• Reinstall the spark plugs and reconnect ignition components.

4. Check Fuel System

• Inspect the fuel filter for clogs; replace if necessary.
• Test the fuel pump operation (ensure it provides adequate pressure).
• Replace the fuel pump if it fails to meet specifications.

5. Inspect Air Intake and Vacuum System

• Remove the air filter and inspect it; replace if dirty or clogged.
• Check the intake manifold and hoses for any signs of leaks and replace as needed.

6. Reconnect Battery and Check Engine

• Reconnect the negative battery terminal.
• Start the engine and monitor for any abnormal noises.
• Perform a test drive to assess if the rough driving experience has improved.